Question

On a etudie la proportion de filles en troisieme au college pendand 3 ans
Anne 2014 2015 2016
Proportion 1/2 3/5 3/10
Calculer la moyenne des proportions de filles
Vă rog ajutațimã urgent dau 55 puncte

Answer 1

Răspuns:

Media proportiilor = 7/15

Explicație pas cu pas:

Proportiile sint : 1/2  ; 3/5 ; 3/10

Media proportiilor :

(⁵⁾1/2 + ²⁾3/5 + ¹⁾3/10)/3 = (5+6+3)/(10·3) = 14/30⁽² = 7/15

Answer 2

( 1 / 2 + 3 / 5 + 3 / 10 ) : 3 = ( 5 / 10 + 6 / 10 + 3 / 10 ) : 3 =

( 11 / 10 + 3 / 10 ) : 3 =

14 / 10 : 3 / 1 =

14 / 10 × 1 / 3 =

14 / 30 = 7 / 15 => media proporțiilor